Stuck in Brake Maintenance Mode

[Onyx]

I couldn't get the truck into the brake maintenance mode using the button method so I tried Forscan and it worked. Now I can't get it out using either of them. Forscan got stuck at 12% the first time before being "interrupted", then 9% the second time.

The truck has been in the low battery setting. I've also had a low DEF warning on the dash to which I need to hit "ok" (cause it does have low DEF).

What should I do? Idle to get the battery up a bit and try again?

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[Onyx]

Still trying to figure this one out. I tried a different version of Forscan (02-23 release) and got the same "service procedure interrupted" for entering and exiting brake service mode. A U0415 DTC appeared after this, Invalid signal from ABS control module 'A'". That code isn't there on the initial read. I'm using the plain english service procedures menu.

I wonder if it could be battery related. I've had it on a 6 amp charger for 10 hours and got the SOC to 100% - reported by the charger. Forscan reported 13.2v. Turning on the ACC immediately dropped Forcan's reported to 12.1v and then after a few minutes it recovered to 12.5v. This is when I attempted to exit brake service mode, with the 6A charger still hooked up. I've read here that this truck draws 18 amps when in ACC so maybe the charger isn't up to par for this, in combination with a weak battery. The ECU is reporting 12.0v during the attempt.

If anyone has suggestions I would love to hear them. Thanks.

 

[rugedraw]

I don't have any suggestions to help, but because this was done with FORscan, try posting here:

https://www.f150gen14.com/forum/threads/2021-f-150-forscan-list-database-spreadsheet.1578/

That thread is followed by a lot of very smart and helpful people who may not be seeing this post in this section.

 

[Onyx]

I don't have any suggestions to help, but because this was done with FORscan, try posting here:

https://www.f150gen14.com/forum/threads/2021-f-150-forscan-list-database-spreadsheet.1578/

That thread is followed by a lot of very smart and helpful people who may not be seeing this post in this section.

Thanks, I'll go do that now.

 

[Onyx]

Update: I was able to get leads from another truck and attempted to exit via both methods with no luck. ECU Power Supply Voltage reported 13.0v on the DTC. So it certainly wasn't a voltage problem. I called my dealership and they said that they've seen this a lot and FDRS is the only way.

On a side note, dealership said it would be fine to drive down so I managed at around 30km/hr. It didn't feel unsafe, just didn't have much power from the brakes. It appeared that the truck wouldn't shift past 3rd (not that I wanted to try anyways!) so I assume a safety limit has been placed as part of brake service mode.

 

[HammaMan]

Did you try disconnecting the battery to let everything fully reset?

 

[Onyx]

Did you try disconnecting the battery to let everything fully reset?

I did. In the end it ended up being that only FDRS can exit. I describe this in other threads, but it wasn't a voltage issue. I brought it to the dealership and they used FDRS to get it out and the service rep said that I can't work on my rear brakes until something changes here.

 

[Philfromutah]

I just encountered this exact problem in my shop using forscan to put a 22 f150 into maintenance mode, it was indeed stuck in maintenance mode no matter what I did with the program or key cycles. After playing around with it for a good little bit I came across this and it worked like a charm.

1. Set the ignition to ON.
2. Press and hold the accelerator pedal and place the EPB switch in the APPLY (upward) position.
Continue to hold the accelerator pedal and the EPB switch.
3. Set the ignition to OFF then set the ignition to ON within 5 seconds. Continue to hold the
accelerator pedal and the EPB switch.
4. NOTE: The EPB system will fully apply and release the parking brake to guarantee sufficient
air gap between the rear brake pads and brake disc.
Release the accelerator pedal and the EPB switch.

 

[Onyx]

I just encountered this exact problem in my shop using forscan to put a 22 f150 into maintenance mode, it was indeed stuck in maintenance mode no matter what I did with the program or key cycles. After playing around with it for a good little bit I came across this and it worked like a charm.

1. Set the ignition to ON.
2. Press and hold the accelerator pedal and place the EPB switch in the APPLY (upward) position.
Continue to hold the accelerator pedal and the EPB switch.
3. Set the ignition to OFF then set the ignition to ON within 5 seconds. Continue to hold the
accelerator pedal and the EPB switch.
4. NOTE: The EPB system will fully apply and release the parking brake to guarantee sufficient
air gap between the rear brake pads and brake disc.
Release the accelerator pedal and the EPB switch.

Thanks, I didn't describe that very well. This sequence method is the very first thing I tried to get the truck into brake service mode (though it's slightly different for getting it in/getting it out). Neither would work for me.

My dealership told me that Ford is aware of this problem on some trucks but there's no fix. They've seen it a few times now and the only way to get the truck out of brake service mode is by using FDRS. I carefully drove my truck to the dealer and their service tech got it out. Free of charge because they're great. I said, "So if I want to work on my rear brakes I can't without a $1500 mongoose cable and FDRS subscription?" And he said, "Unfortunately right now, no".

So I caution people: If you can't get your truck into brake service mode by using the sequence that Ford gives you, don't then try to use Forscan to force it to go.

 

[Corney2022]

Hello all,

I have came across a new way to take it out of brake maintenance mode ford changed there little sequence for whatever reason it was quite a pain to find so I thought I’d share this info so it’s more readily available to everyone who shares the same issue we all have encountered

 

[Andy Met]

Not sure if this is to aid anybody but this is what a friend mechanic told me on the brake maintenance issues: Just don't use it !! Unplug the electrical connector from the park brake motor, take a 12v battery and 2 pieces of wire and connect the positive and negative from the motor to the battery. That should wind the parking brake back to retract (if it doesn't switch the polarity on either the motor or the battery end). Once rewound do whatever you need to do on your brakes and put the brakes back together. When done turn ignition on and let the brakes cycle, when that's done apply parking brake with the switch and release. Done.

 

[Onyx]

Not sure if this is to aid anybody but this is what a friend mechanic told me on the brake maintenance issues: Just don't use it !! Unplug the electrical connector from the park brake motor, take a 12v battery and 2 pieces of wire and connect the positive and negative from the motor to the battery. That should wind the parking brake back to retract (if it doesn't switch the polarity on either the motor or the battery end). Once rewound do whatever you need to do on your brakes and put the brakes back together. When done turn ignition on and let the brakes cycle, when that's done apply parking brake with the switch and release. Done.

Neat trick! I'll certainly give that a go next time if it isn't fixed by then (which it probably won't be)

 

[rslong110]

FWIW, I used FORSCAN to put my vehicle into Brake Maintenance Mode, but I could not get it out of BMM. I have the 2024 Launch Creader Elite I purchased from Amazon (Launch Creader Elite). It was able to get the vehicle out of BMM.

I Noticed the procedure on the Launch Creader Elite indicates you must depress and hold the brake pedal when exiting the BMM. Forscan did NOT mention this at all and was not able to get out of BMM.

I will try applying brake pressure using FORSCAN and see if that works.

More to follow...

Next day: This time I applied the brake pedal before "exiting" BMM and it worked!! Forscan needs to add the note to "apply and hold brake pedal pressure" until BMM has reset.

 

[Onyx]

FWIW, I used FORSCAN to put my vehicle into Brake Maintenance Mode, but I could not get it out of BMM. I have the 2024 Launch Creader Elite I purchased from Amazon (Launch Creader Elite). It was able to get the vehicle out of BMM.

I Noticed the procedure on the Launch Creader Elite indicates you must depress and hold the brake pedal when exiting the BMM. Forscan did NOT mention this at all and was not able to get out of BMM.

I will try applying brake pressure using FORSCAN and see if that works.

More to follow...

Next day: This time I applied the brake pedal before "exiting" BMM and it worked!! Forscan needs to add the note to "apply and hold brake pedal pressure" until BMM has reset.

Thanks for that suggestion! Time to grease the slider pins and was going to forgo the back calipers this year.

 

[mmurphy1191]

Hello all,

I have came across a new way to take it out of brake maintenance mode ford changed there little sequence for whatever reason it was quite a pain to find so I thought I’d share this info so it’s more readily available to everyone who shares the same issue we all have encountered

Ive been working on my 21 f150 for a couple of days trying everything to get it out of brake service mode. This saved the day!!! Thank you!!!

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